The most striking of the new livery is the absence of sponsor RoKit. The sponsor and the team announced after the Australian Grand Prix that the collaboration had been broken and this can now be seen again. Acronis and Sofina will take a more prominent role on the chassis.
Source: Williams F1 Media1/3
Where Williams was expected to return to the dark blue, the team opted for a lot of white. With different shades of blue and some black accents here and there, the Williams is a unique livery.
Source: Williams F1 Media2/3
In the front view the chassis seems to be quite glazed. Whether this is due to the studio photo, or whether the team actually prefers gloss paint over the currently popular mat, remains to be seen.
Source: Williams F1 Media3/3